Any runners around?

[looklook123123]

I would love some tips on how to improve my 5k time. I have been trying to work on speed (400 repeats) + indurance training (4-5 miles on my long run saturday).

Your long runs need to be longer than 4 or 5miles and your speed workouts need to be more than 400s.
If you're looking to improve your 5k time, your long run of the week needs to be 20-25% of your total distance for the week. Why? If your body only recognizes you running a mile or so more than the actual race itself, it won't be able to withstand running about the same distance on a competitive level. The long runs don't have to be fast, and can be a little slower than your regular runs.

If you're trying to keep a better overall pace in a 5k, your workout should be ~3.5miles such as mile, mile and a half, half mile, half mile. with 1-2minute breaks in between each.
It'll be more than your actual race, but the breaks will help, and you can always crush the half miles at the end.